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How to restore the ringtone and SMS ringtone after upgrading OPPO system?
How to restore the ringtone and SMS ringtone after upgrading OPPO system? If you want to restore the ringtone that came with the system before the upgrade, you can only back up the important data files in your mobile phone, then go to the customer service center for free downgrade and brush back the previous system version. You can quickly find the address and telephone number of OPPO Customer Service Center in the following ways:
1. Enter the OPPO official website-Service-Service Network for inquiry; 2. Enter OPPO+- Home-Recommendation-Customer Service-Service Network.
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